You Own the Building. You Rent It to Your Business. The IRS Has a Trap for That.

This is one of the most common setups I see: you own commercial real estate — your office, your shop, your warehouse — in a separate LLC. Your S-corp pays rent to that LLC every month. Looks clean. Makes sense legally. And then the IRS applies a rule that most owners have never heard of, and it quietly destroys the tax benefit you thought you were building.

The Setup That Creates the Problem

Let’s say you own the building through an LLC, and your S-corp pays $3,000 a month in rent — $36,000 a year. That income flows to the LLC, which should generate losses after depreciation, mortgage interest, and property taxes. Your plan: the losses from the LLC offset income somewhere else.

Here’s where it goes sideways.

Under IRS passive activity rules, rental activity is normally passive. But there’s a specific exception that applies when you rent property to your own business. The IRS calls it the self-rental rule, and it works like this: your rental income gets recharacterized as non-passive, but your rental losses stay passive.

That asymmetry is the trap.

What It Means in Dollar Terms

If your building generates $36,000 in rent and you net $5,000 of income after expenses, that $5,000 gets treated as active income — taxed at your ordinary rate. You can’t offset it with passive losses from other rental properties.

Now flip it. If you do a cost segregation study and accelerate depreciation, the building starts throwing off $20,000 in paper losses. You expect to use those losses against your S-corp profits. You can’t. They’re passive. They sit in a passive loss carryforward until you have passive income to absorb them — or you sell the property.

The income is active. The losses are passive. The IRS designed this rule specifically to prevent business owners from manufacturing losses through self-rentals.

The Fix: The Grouping Election

There is a way around this. Under Treasury Regulation 1.469-4, you can make what’s called a grouping election — treating your rental activity and your operating business as a single activity for passive activity purposes.

When they’re grouped, the whole picture looks like one active business. Rental losses from the building offset S-corp income. The non-passive/passive asymmetry disappears.

Two requirements to qualify:

Same ownership in both entities. You need the same proportionate ownership in the LLC and the operating company. If you own 100% of the building LLC and 100% of the S-corp, you qualify. Spouses count as a single unit for this test — married joint owners with identical percentages qualify even if the ownership is split.

Economic connection. The activities need to constitute an “appropriate economic unit.” Renting your shop to your own business qualifies. The IRS isn’t going to dispute that they’re economically connected.

The Timing Problem

Here’s the part that trips people up: the grouping election must be made in the first year the rental activity begins. You file a disclosure statement with your tax return in that first year, and the election is binding going forward.

If you’ve been renting to your own business for three years without making the election, you can’t retroactively apply it to those prior returns. You can still make it going forward — but you lose whatever benefit you would have had in the early years.

Miss the window entirely, and you could end up carrying passive losses on the building for years — until you sell, or until some other passive income absorbs them.

When This Matters Most

If you’re doing a cost segregation study. Accelerating depreciation on your commercial building creates larger losses. Without the grouping election, those losses are trapped. With it, they offset the active income from your business. This is the combination that makes cost segregation worth running the numbers on.

If you’re profitable. Self-rental income taxed as non-passive means you can’t use passive losses from other sources to offset it. The more profitable your business, the more the recharacterization costs you.

If you’re just buying your building now. This is the moment to get the structure and the election right. It’s much easier to do it correctly on year one than to fix it three years later.

If you want to understand how passive activity rules work in a standard rental context, this post explains why rental losses get trapped and how to free them. If you’re considering cost segregation on commercial property, here’s how that strategy works.

The building and the business are one economic unit. The IRS can treat them that way — and that’s actually what you want. You just have to ask for it on time.

This post is for general informational purposes only and does not constitute tax, legal, or financial advice. Passive activity rules are complex and fact-specific; consult a qualified tax professional before making any decisions about your real estate or business structure.